摘要
介绍了一种适用于大规模工业化生产高强度金属过滤用碳化硅泡沫陶瓷的方法。采用商用SiC粉体和聚氨酯泡沫通过2次挂浆工艺可以制备出最大平均抗弯强度达到2.87 MPa,平均孔径在3 mm左右,同时具备优良的抗热震性能和高达1700℃耐火度的碳化硅泡沫陶瓷。探讨了浆料的粘度、流变性能对挂浆性能的影响及第2次挂浆对强度的增强机理,说明1次浆料的触变性能和适当固相含量的2次浆料是高强度泡沫陶瓷制备的关键,而2次挂浆工艺对强度提高的主要贡献来源于第2次浆料对1次挂浆烧结后留下空洞的有效弥补。
A process for preparing high strength SiC-matrix foam ceramics used in filter of molten metal for mass production was developed. The maximum average flexural strength of SiC-matrix foam ceramics prepared with commercial SiC particles and polyurethane sponge as starting materials through twice coating process can be reached 2.87 MPa and the average hole diameter is about 3 mm. Moreover it has excellent thermal shock resistance and high refractoriness of over 1700°C. The effects of viscosity, rheological behavior of slurry on properties of foam ceramics and the mechanism to improve strength by twice coating process are discussed. Thixotropic behavior of the first slurry and proper solid content in the second slurry are the key factors to prepare high performance foam ceramics, and the effective remedy of holes formed after once coating and sintering by the second slurry results to improve strength after twice coating process.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2004年第2期107-112,共6页
Journal of The Chinese Ceramic Society
基金
863计划资助项目
关键词
泡沫陶瓷
碳化硅
金属过滤器
制备
Bending strength
Filters (for fluids)
Refractory materials
Rheology
Silicon carbide
Viscosity of liquids
